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This dataset contains a satellite observed timeseries of the extent of winter irrigated crop areas in NSW from present day, back to 1987. <\/span><\/p>

Observations have been derived from medium-resolution multi-spectral satellite imagery (30m/pixel Landsat with a 16 day return interval and 10 m/pixel Sentinel-2 with a 5 day return interval). <\/span><\/p>

The presence of irrigated crops is identified using established vegetation\u2011condition indicators commonly referenced in remote\u2011sensing literature to assess crop vigour and water\u2011stress patterns. Additionally, Earth observation-derived evapotranspiration datasets are incorporated to support the estimation of irrigated crop areas, improving the distinction between irrigated and non\u2011irrigated agricultural land. <\/span><\/p>

Expert opinion is then applied to qualify whether a field was irrigated, based on its greenness relative to the surrounding landscape throughout the winter season (May to October). The polygons are delineated in a semi-supervised manner and are accurate to the closest hectare.<\/span><\/p>

A metadata and data quality statement is available in the Documents section of the dataset homepage on the NSW SEED portal.<\/span><\/p><\/div><\/div><\/div><\/div>", "mapName": "Irrigated Crop Areas - Winter", "description": "This dataset contains a satellite observed timeseries of the extent of winter irrigated crop areas in NSW from present day, back to 1987. Observations have been derived from medium-resolution multi-spectral satellite imagery (30m/pixel Landsat with a 16 day return interval and 10 m/pixel Sentinel-2 with a 5 day return interval). The presence of irrigated crops is identified using established vegetation\u2011condition indicators commonly referenced in remote\u2011sensing literature to assess crop vigour and water\u2011stress patterns. Additionally, Earth observation-derived evapotranspiration datasets are incorporated to support the estimation of irrigated crop areas, improving the distinction between irrigated and non\u2011irrigated agricultural land. Expert opinion is then applied to qualify whether a field was irrigated, based on its greenness relative to the surrounding landscape throughout the winter season (May to October). 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Observations have been derived from medium-resolution multi-spectral satellite imagery (30m/pixel Landsat with a 16 day return interval and 10 m/pixel Sentinel-2 with a 5 day return interval). The presence of irrigated crops is identified using established vegetation\u2011condition indicators commonly referenced in remote\u2011sensing literature to assess crop vigour and water\u2011stress patterns. Additionally, Earth observation\u2013derived evapotranspiration datasets are incorporated to support the estimation of irrigated crop areas, improving the distinction between irrigated and non\u2011irrigated agricultural land. Expert opinion is then applied to qualify whether a field was irrigated, based on its greenness relative to the surrounding landscape throughout the winter season (May to October). 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